[Dovecot] strange quota error

[JOHN ROMAN]

i have a dovecot setup that uses an nfs backend to store maildir data.  i want to enforce fs quotas, but whenever theyre selected and i attempt to query them from thunderbird...this appears in the log

quotactl(Q_GETQUOTA, /.amd_mnt/crock/vol/v_user1/jdoe) failed: Operation not supported

i also occasionally see this.

dovecot: statfs(/users/jdoe/Maildir) failed: Permission denied


i can manually query quotas from a terminal on the mail system though.