Hello,
I added
lxc.rootfs.options = grpquota,usrquota
to /etc/pve/lxc/100.conf
But no success:
[root@haugen /]# mount | grep 'on / '
/images/421/vm-421-disk-1.raw on / type ext4 (rw,relatime,quota,usrquota,grpquota,data=ordered)
[root@haugen /]# quotacheck -gum /
quotacheck: Cannot stat()...