Quota on OverlayFS supported?

["Sebert, Holger.ext" <Holger.Sebert.ext@xxxxxxxxxxxxx>]

Hi,

On my system I use OverlayFS. The overlay filesystem is mounted as
follows:

    mount -t overlay overlay -o lowerdir=${ROMOUNT},upperdir=${UPPER_DIR},workdir=${WORK_DIR} ${NEWROOT}

with the variables ROMOUNT, UPPER_DIR, WORK_DIR and NEWROOT pointing
to the relevant directories.

I tried to activate quota by adding the mount options 'usrquota' and
'grpquota' to the above mount command as follows:

    mount -t overlay overlay -o lowerdir=${ROMOUNT},upperdir=${UPPER_DIR},workdir=${WORK_DIR},usrquota,grpquota ${NEWROOT}

While I don't get an error, the quota tools report that quota isn't
activated on the (overlay-)filesystem containing the r/w uppder dir.

This makes me wonder whether quotas are actually supported by OverlayFS?

I searched the web, asked on ServerFault, but did not receive a definite
answer.

Thanks!

-Holger