When using makeRelativePath, it returns an incorrect path when trying to fetch an entry from the root:

  $fs->makePathRelative('/foo/bar/baz', '/');

Actual result:

  ../foo/bar/baz

Expected result:

  foo/bar/baz

As we have specified an absolute path, there is no point on having an .. added. It works, because a root directory has a .. which points to itself, but it could result in issues when the relative path is actually prefixed or concatted.