Update usage message to specify quotas should be set on sub-ZFSs, not the parent

ROOT/DEBIAN/control

@@ -3,6 +3,6 @@ Priority: optional
 Section: otherosfs
 Maintainer: Chemistry COs <support@ch.cam.ac.uk>
 Architecture: all
-Version: 0.9-ch87
+Version: 0.9-ch88
 Depends: zfs-dkms, postgresql-13 | postgresql-9.5 | postgresql-9.4 , liblockfile-simple-perl, libdbi-perl, libjson-perl, libzfs-perl-chem, libnet-openssh-perl, libdbd-pg-perl, mbuffer, rsync, nfs-kernel-server, pv, libwww-curl-perl
 Description: a backup system using ZFS (repository 'backup-scheduler')

ROOT/usr/lib/chem-zfs-backup-server/new-backup-rsnapshot

@@ -174,5 +174,8 @@ while ! [ -z $1 ] ; do
 done
 dosql "update host set disabled=false where hostname='$FQDN';"
 
-echo "Please set a quota:"
-echo "  zfs set quota=\$QUOTA $TGT"
+ZFSs=$(zfs list -r -H -oname $TGT | grep -v ${TGT}$)
+echo "Please check/set quotas on child ZFSs:"
+for ZFS in $ZFSs; do
+  echo "  zfs set quota=\$QUOTA $ZFS"
+done