How to make this Filtering Enabled?

originalAmmo = script.Parent.Ammo.Value
m = Instance.new("Message")

function computeDirection(vec)
	local lenSquared = vec.magnitude^2
	local invSqrt = 1 / math.sqrt(lenSquared)
	return Vector3.new(vec.x * invSqrt, vec.y * invSqrt, vec.z * invSqrt)
end



function updateAmmo()
	m.Text = " "
	--for i = 1,script.Parent.Ammo.Value do
	--	m.Text = m.Text .. "|"
	--end
	--for i = 1, (originalAmmo - script.Parent.Ammo.Value) do
	--	m.Text = m.Text .. " "
	--end
	m.Text = m.Text .. " " .. script.Parent.Ammo.Value.. "/10"
end


function fire(v)
	for i = 1,1 do
		script.Parent.Handle.Fire:play()
		script.Parent.Ammo.Value = script.Parent.Ammo.Value - 1
		updateAmmo()

		local dir = v - script.Parent["Handle"].Position
		dir = computeDirection(dir)

		local pos = script.Parent["Handle"].Position + (dir * 6)

		local p = Instance.new("Part")
		p.Name = "Projectile"
		p.CFrame = CFrame.new(pos, pos + dir)
		p.BrickColor = BrickColor.new(21)
		p.Reflectance = 0.1
		p.Velocity = (script.Parent.Parent["Head"].Position - v).unit * -150
		p.Size = Vector3.new(1, 0.4, 1)
		p.formFactor = 2

		local mesh = script.Parent.Mesh:clone()
		mesh.Parent = p

		local upforce = Instance.new("BodyForce")
		upforce.force = Vector3.new(0, p:GetMass() * 196, 0)
		upforce.Parent = p

		local creator = Instance.new("ObjectValue")
		creator.Name = "creator"
		creator.Value = game.Players:GetPlayerFromCharacter(script.Parent.Parent)
		creator.Parent = p

		local s = script.Parent["ProjectileScript"]:Clone()
		s.Disabled = false
		s.Parent = p
		p.Parent = game.Workspace
		wait(0)
	end
end


function onActivated()
	if script.Parent.Enabled == true then
		script.Parent.Enabled = false
		if script.Parent.Ammo.Value > 0 then
			fire(script.Parent.Parent["Humanoid"].TargetPoint)
		else
			script.Parent.Enabled = false
			script.Parent.Handle.Reload:play()
			m.Text = "Reloading."
			for i =1,5 do
				wait(0.3)
				m.Text = m.Text .. "."
			end
			script.Parent.Ammo.Value = originalAmmo
			updateAmmo()
			script.Parent.Enabled = true
		end
		wait(0.1)
		script.Parent.Enabled = true
	end
end


function onEquipped()
	local p = game.Players:GetChildren()
	for i = 1,#p do
		if p[i].Character == script.Parent.Parent then
			m.Parent = p[i]
		end
	end
	updateAmmo()
end

function onUnequipped()
	m.Parent = nil
end


script.Parent.Activated:connect(onActivated)
script.Parent.Equipped:connect(onEquipped)
script.Parent.Unequipped:connect(onUnequipped)

Well, we can not help you with the overall process of turning this code into a filtering enabled one as this is not a request site for you to utilize. We can only suggest you the tools and help you along the journey!

With that said, I will provide you a few Roblox API links that could really help you get into how to turn this code into a filtering enabled one.

Here is the explanation of what is Filtering Enabled and the properties it has, make sure to read the exceptions, very important so you do not lose time if you commit one!

https://developer.roblox.com/en-us/api-reference/property/Workspace/FilteringEnabled

As for the Filtering Enabled core communication tools you have Remote Events and Remote Functions, the link I will provide will explain in detail with examples all the possible communications you can do.

https://developer.roblox.com/en-us/articles/Remote-Functions-and-Events

I also have an answer on a question on Scripting Helpers on where to put your scripts in case you attempt to script with Filtering Enabled.

https://scriptinghelpers.org/questions/55070/whats-the-best-place-to-store-local-scripts#53918

This is just a few of the links full with information that you can utilize to learn to code in Filtering Enabled and finally end up transforming your code to Filtering Enabled.

Good luck with your journey on transforming the code to Filtering Enabled, make sure to ask more questions if you get stuck with your attempt.

:)