{
  fileSystems."/" =
    { device = "/dev/disk/by-label/NixOS";
      fsType = "btrfs";
      options = [ "discard" "compress" "subvol=@" ];
    };
  fileSystems."/home" =
    { device = "/dev/disk/by-label/NixOS";
      fsType = "btrfs";
      options = [ "discard" "compress" "subvol=@home" ];
    };
}