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Problem:
On Windows, `fnamemodify('//foo/C$', ':h')` incorrectly removes `C$`
as a regular file name and returns `//foo`. However, this is a valid
UNC path, `foo` is a server name and `C$` is a share name.
The correct result should be `//foo/C$`.
Solution:
Extend `os_fileinfo2` and `FileInfo` with `prefix_off`, `rest_off` to
identify path types and logical root boundaries. ':h' can use this info
to prevent traversing past the logical root.
Examples:
/foo => /
//foo => // (POSIX)
//foo/bar => //foo (POSIX)
//server/share/foo => //server/share/ (Windows)
C:/foo => C:/
//?/C:/foo => //?/C:/
Co-authored-by: Barrett Ruth <br@barrettruth.com>