Hello @Nils_Hannaas,
Since ROCK is a Linux-based operating system, only the drivers that have been patched over to Linux will be available for use.
We use a 3rd party module for Native DSD on Linux and I can see here that this functionality has not been added for Moon DACs yet.
Please note, this is not a complete list, but it will give you a good idea of the DACs that can accept Native DSD on Linux.
Thanks,
Noris