[root@cn02 (us-west-agc) ~]# zfs get mounted,mountpoint zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf
NAME PROPERTY VALUE SOURCE
zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf mounted yes -
zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf mountpoint /zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores local
[root@cn02 (us-west-agc) ~]# zfs umount /zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores
cannot unmount '/zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores': not a mountpoint
[root@cn02 (us-west-agc) ~]# mount | egrep ^/zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores
/zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores on zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf read/write/setuid/devices/nonbmand/exec/xattr/noatime/dev=1690135 on Fri May 7 14:25:17 2021
[root@cn02 (us-west-agc) ~]# zfs umount /zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores
cannot unmount '/zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores': not a mountpoint
[root@cn02 (us-west-agc) ~]# zfs unmount /zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores
cannot unmount '/zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores': not a mountpoint
[root@cn02 (us-west-agc) ~]# zfs unmount zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf
[root@cn02 (us-west-agc) ~]# zfs get mounted,mountpoint zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf
NAME PROPERTY VALUE SOURCE
zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf mounted no -
zones/cores/a2d5015e-e073-4758-b37f-44aa2aabddbf mountpoint /zones/a2d5015e-e073-4758-b37f-44aa2aabddbf/cores local