Unable to change the ownership and permission of ZFS share using root-- getting Operation not permi

Unable  to change the ownership and permission of ZFS share.

[root@x301dbadm01 nzlogs]# chmod 777 an

chmod: changing permissions of `an': Operation not permitted

[root@x301dbadm01 nzlogs]# chown oracle:oinstall fileb

chown: changing ownership of `fileb': Operation not permitted

[root@x301dbadm01 nzlogs]#

[root@x301dbadm01 nzlogs]# ls -ltr

total 1

-rwxrwxrwx 1 root root 0 Apr  1 06:39 fileb

-rw-r--r-- 1 root root 0 Apr  1 07:24 an

[root@x301dbadm01 nzlogs]#

Please let me know how to fix this issue.

Thank you!!