case "":
		return "."
	case string(filepath.Separator):
		// do nothing to the path
		return path
	default:
		return path[0 : len(path)-1] // chop off trailing separator
	}
}

func volumeNameLen(path string) int {
	isSlash := func(c uint8) bool {
		return c == '\\' || c == '/'
	}
	if len(path) < 2 {
		return 0
	}
	// with drive letter
	c := path[0]

	targ := Clean(targpath)
	if sameWord(targ, base) {
		return ".", nil
	}
	base = base[len(baseVol):]
	targ = targ[len(targVol):]
	if base == "." {
		base = ""
	} else if base == "" && filepathlite.VolumeNameLen(baseVol) > 2 /* isUNC */ {
		// Treat any targetpath matching `\\host\share` basepath as absolute path.
		base = string(Separator)
	}

	// Can't use IsAbs - `\a` and `a` are both relative in Windows.