{
  fileSystems =
    let
      defaultOptions = [ "compress=zstd" ];
    in
    {
      "/boot" = {
        device = "/dev/xvda1";
        fsType = "vfat";
        options = [ "umask=0077" ];
      };

      "/" = {
        device = "/dev/xvda2";
        fsType = "btrfs";
        options = [ "subvol=@" ] ++ defaultOptions;
      };

      "/nix" = {
        device = "/dev/xvda2";
        fsType = "btrfs";
        options = [ "subvol=@nix" ] ++ defaultOptions;
      };

      "/home" = {
        device = "/dev/xvda2";
        fsType = "btrfs";
        options = [ "subvol=@home" ] ++ defaultOptions;
      };

      "/persist" = {
        device = "/dev/xvda2";
        fsType = "btrfs";
        options = [ "subvol=@persist" ] ++ defaultOptions;
      };
    };
}