# File lib/sys/windows/sys/filesystem.rb, line 246
    def self.mount_point(file)
      wfile = FFI::MemoryPointer.from_string(file.to_s.wincode)

      if PathStripToRootW(wfile)
        wfile.read_string(wfile.size).split("\000\000").first.tr(0.chr, '')
      else
        nil
      end
    end