fileSystems."/my-fs" =
{ device = "/dev/disk/by-uuid/my-uuid";
  fsType = "xfs";
  neededForBoot = false;
};

fileSystems."/run/media/my-user/my-uuid" =
{ device = "/my-fs";
  fsType = "none";
  options = [ "bind" ];
  neededForBoot = false;
};