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Listing btrfs subvolumes not allowed in container

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I try to run a btrbk server within a systemd container. Unfortunately, I cannot get btrbk running since the command btrfs subvolume list /srv/backup fails to run from within the container with "Operation not permitted".

I already tried adding "user_subvol_rm_allowed" to the mount options, as suggested in a lxc issue, however without luck. While btrfs subvolume delete /srv/backup/foobar works now, I still don't get a subvolume listing.

Is this possible at all?

My servers run an up-to-date Debian bullseye (kernel 5.10.0, btrfs-progs 5.10.1).

Thanks for your help!

mangohost

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