# File lib/sys/unix/sys/filesystem.rb, line 364
    def self.mount_point(file)
      dev = File.stat(file).dev
      val = file

      self.mounts.each{ |mnt|
        mp = mnt.mount_point
        begin
          if File.stat(mp).dev == dev
            val = mp
            break
          end
        rescue Errno::EACCES
          next
        end
      }

      val
    end