If you need to remove the mapping of null users to windows user or group in NetApp, it can be done with the following steps
Step 1: Set the privilege level to advanced:
# set -privilege advanced
Step 2: Configure the restrict anonymous setting:
# vserver cifs options modify -vserver vserver_name -restrict-anonymous {no-restriction|no-enumeration|no-access}
Step 3: Verify that the option is set to the desired value:
vserver cifs options show -vserver vserver_name
Step 4: Return to the admin privilege level:
set -privilege admin