configuration.nix/hosts/rico1/hardware/filesystem.nix

_: {
  fileSystems = {
    "/" = {
      device = "/dev/disk/by-partlabel/RICO1_ROOT";
      fsType = "btrfs";
      options = [ "subvol=@root" "compress-force=zstd" "noatime" ];
      neededForBoot = true;
    };

    "/nix" = {
      device = "/dev/disk/by-partlabel/RICO1_ROOT";
      fsType = "btrfs";
      options = [ "subvol=@nix" "compress-force=zstd" "noatime" ];
      neededForBoot = true;
    };

    "/persist" = {
      device = "/dev/disk/by-partlabel/RICO1_ROOT";
      fsType = "btrfs";
      options = [ "subvol=@persist" "compress-force=zstd" "noatime" ];
      neededForBoot = true;
    };

    "/mnt/system" = {
      device = "/dev/disk/by-partlabel/RICO1_ROOT";
      fsType = "btrfs";
      options = [ "subvol=/" "compress-force=zstd" "noatime" ];
    };

    "/boot" = {
      device = "/dev/disk/by-partlabel/RICO1_BOOT";
      fsType = "vfat";
      options = [ "fmask=0022" "dmask=0022" ];
    };
  };
}