I wanted to create NFS share. I did that successfully during my tests on privileged container. now I try to setup more secure environment. When I create NFS share in webmin i get

rpc.nfsd: no process found
Stopping nfs-kernel-server (via systemctl): nfs-kernel-server.service.
Starting nfs-kernel-server (via systemctl): nfs-kernel-server.serviceA dependency job for nfs-server.service failed. See 'journalctl -xe' for details.
failed!

I stared investigation and I see that dependency proc service not running and I cannot start it.

​​​​root@nas ~# mount | grep nfsd
root@nas ~# mount -v -t nfsd nfsd /proc/fs/nfsd
mount: /proc/fs/nfsd: permission denied.
root@nas ~# ls -la /proc/fs    
total 0
dr-xr-xr-x   7 nobody nogroup 0 Jun 26 01:12 .
dr-xr-xr-x 539 nobody nogroup 0 Jun 26 01:12 ..
dr-xr-xr-x   9 nobody nogroup 0 Jun 26 11:05 ext4
dr-xr-xr-x   9 nobody nogroup 0 Jun 26 11:05 jbd2
dr-xr-xr-x   3 nobody nogroup 0 Jun 26 01:12 lockd
dr-xr-xr-x   3 nobody nogroup 0 Jun 26 11:05 nfs
dr-xr-xr-x   2 nobody nogroup 0 Jun 26 01:12 nfsd

When I try to change permissions or ownership of those directories, I get operation is not permitted.