But I am mounting those directories from the host, which will be:
[root@v1 /postgres_data/p3-dev-db-93]# mount -l | grep postgres-93-upgrade
sata-data/usr/jails/postgres-93-upgrade on /usr/jails/postgres-93-upgrade (zfs, local, nfsv4acls)
/usr/jails/basejail on /usr/jails/postgres-93-upgrade/basejail (nullfs, local, read-only)
devfs on /usr/jails/postgres-93-upgrade/dev (devfs, local, multilabel)
fdescfs on /usr/jails/postgres-93-upgrade/dev/fd (fdescfs)
procfs on /usr/jails/postgres-93-upgrade/proc (procfs, local)
/usr/jails/postgres-90-upgrade/usr/local/bin on /usr/jails/postgres-93-upgrade/home/jkregloh/pg_bin (nullfs, local)
/dev_db/stop_db/postgres_data on /usr/jails/postgres-93-upgrade/home/jkregloh/pg_data/data (nullfs, local)
/dev_db/stop_db/postgres_archive_data on /usr/jails/postgres-93-upgrade/home/jkregloh/pg_data/data_archive (nullfs, local)