How does :FindFirstAncestor() find the first ancestor?

https://developer.roblox.com/en-us/api-reference/function/Instance/FindFirstAncestor

So I wanted to know how "FindFirstAncestor" works because I want to modify it for my personal needs. I already know how to use the function, but I want to know how it's source code works. It's source code isn't posted anywhere. How does it find the first ancestor?

I don't know but this is my guess. This is hardly tested and is very messy, and likely won't work but this is my basic idea.

local function findAncestor(object,name)
	local Parents = {}
	local Index = object
	local Done = false
	repeat
		table.insert(Parents,Index.Parent)
		
			
			print(Index)
		if Index.Parent.Name == name then
			Done = true
		elseif Index == game then
			Done = true
		end

		Index = Index.Parent
	until Done == true
	return Index
end

findAncestor(PartExample, "NameExample") -- Example