{
  fileSystems."/mnt/usb_share" = {
    device = "/piusb.bin";
    fsType = "exfat";

    options = [
      "loop"
      "noatime"
      "nofail"
      "rw"
      "umask=000"
      "users"
      "dmask=000"
      "fmask=000"
    ];
  };
}