unionfs on ufs2 gives "operation not supported"

[BSDC]

Getting "operation not supported" messages on a long ls listing with
unionfs mounts. Trying to setup a jail using unionfs, has anyone any
ideas why I'm seeing this with ls?

# mount
/dev/da0s1a on / (ufs, local, noatime, soft-updates, acls)
devfs on /dev (devfs, local, multilabel)
/dev/vinum/usr on /usr (ufs, NFS exported, local, noatime, soft-updates, acls)
/dev/vinum/var on /var (ufs, local, noatime, soft-updates, acls)
<below>:/usr/jail/template on /usr/jail/172.16.1.1 (unionfs, noatime, noclusterw, acls)
^^^^^^^

# ls -l /usr/jail/172.16.1.1/
ls: /usr/jail/172.16.1.1/.cshrc: Operation not supported
-rw-r--r--   2 root  wheel   797 Dec 24 03:04 .cshrc
ls: /usr/jail/172.16.1.1/.profile: Operation not supported
-rw-r--r--   2 root  wheel   251 Dec 24 03:04 .profile
ls: /usr/jail/172.16.1.1/COPYRIGHT: Operation not supported
-r--r--r--   1 root  wheel  4735 Dec 24 03:04 COPYRIGHT
ls: /usr/jail/172.16.1.1/bin: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 bin
ls: /usr/jail/172.16.1.1/boot: Operation not supported
drwxr-xr-x  10 root  wheel   512 Dec 24 04:07 boot
ls: /usr/jail/172.16.1.1/dev: Operation not supported
drwxr-xr-x  10 root  wheel   512 Dec 24 04:07 dev
ls: /usr/jail/172.16.1.1/etc: Operation not supported
drwxr-xr-x  34 root  wheel   512 Dec 24 08:04 etc
lrwxr-xr-x   1 root  wheel     8 Dec 24 03:04 kernel -> dev/null
ls: /usr/jail/172.16.1.1/lib: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 lib
ls: /usr/jail/172.16.1.1/libexec: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 libexec
ls: /usr/jail/172.16.1.1/mnt: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 mnt
ls: /usr/jail/172.16.1.1/proc: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 proc
ls: /usr/jail/172.16.1.1/rescue: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 rescue
ls: /usr/jail/172.16.1.1/root: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 root
ls: /usr/jail/172.16.1.1/sbin: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 04:07 sbin
lrwxr-xr-x   1 root  wheel    11 Dec 24 03:01 sys -> usr/src/sys
ls: /usr/jail/172.16.1.1/tmp: Operation not supported
drwxr-xr-x   4 root  wheel   512 Dec 24 08:03 tmp
ls: /usr/jail/172.16.1.1/usr: Operation not supported
drwxr-xr-x  28 root  wheel   512 Dec 24 04:07 usr
ls: /usr/jail/172.16.1.1/var: Operation not supported
drwxr-xr-x  40 root  wheel   512 Dec 24 04:21 var
total 38