configuration.nix/hosts/skipper/hardware/filesystem.nix

{...}: {
  fileSystems = {
    "/" = {
      device = "/dev/vg0/system";
      fsType = "btrfs";
      options = ["subvol=@root" "compress-force=zstd" "noatime"];
      neededForBoot = true;
    };
    "/home" = {
      device = "/dev/vg0/system";
      fsType = "btrfs";
      options = ["subvol=@home" "compress-force=zstd" "noatime"];
    };
    "/nix" = {
      device = "/dev/vg0/system";
      fsType = "btrfs";
      options = ["subvol=/@nix" "compress-force=zstd" "noatime"];
      neededForBoot = true;
    };
    "/persist" = {
      device = "/dev/vg0/system";
      fsType = "btrfs";
      options = ["subvol=/@persist" "compress-force=zstd" "noatime"];
      neededForBoot = true;
    };
    "/mnt/system" = {
      device = "/dev/vg0/system";
      fsType = "btrfs";
      options = ["subvol=/" "compress-force=zstd" "noatime"];
    };
    "/boot" = {
      device = "/dev/disk/by-partlabel/ESP";
      fsType = "vfat";
    };
  };
}