How can I disable NetBios traffic on Celerra CIFS server?

I ended up blocking it on the switch

Cisco 3750 series switches are used at our facilities.

Extended IP access list NETBIOS

    deny tcp any any eq 135

    deny udp any any eq 135

    deny tcp any any range 137 139

    deny udp any any range netbios-ns netbios-ss

    deny tcp any any eq 445

    deny udp any any eq 445

    deny udp any any eq 5355

    permit ip any any

Then attach that access list to the ports that the CIFS interfaces are connected to with

ip access-group NETBIOS in

where in this example the access list name is NETBIOS.  (In theory you could name it anything you want or incorporate it with other access lists.)

Otherwise on our network via GPO we disable Multicast Name Resolution (LLMNR), disable netbios via DHCP option 001, and on static servers or non-domain joined systems we manually disable netbios on the interfaces and LLMNR with local security policy.  This greatly reduces man in the middle attacks using SMB relay, even though we turned on force SMB encryption to mitigate that attack our Pen tester demonstrated to us, we went further and disabled those protocols entirely.  In a modern business network I highly recommend it.