WRT1900AC and its' NETBIOS name...

Question

I have third party backup software that recognizes NETBIOS names and it tells me that my WRT1900AC Router is broadcasting "WORKGROUP" on my local network in addtion to the name my Windows client computers use.  I want all my computers/wire connected devices to use the same NETBIOS name when they are talking on my wired network, and to be able to include the disk attached to the router in that network so that things are handled efficiently and consistently by XP, Vista, and Win7 clients.  I can't find a way to change it using the web interface I have access to which is the "out of the box" 192.168.0.1/.... address (Which my 64 bit Windows IE 11 based Norton security software thinks has an "expired certificate" even though the firmware is up to date!)  I think I used to be able to do it on an older Linksys E3000 that eventually died, but its' support for a USB attached disk was really slow compared to the WRT1900AC's eSata connection, so I did not try to host backups there and went around my network with an eSata enclosure and manually backed up each computer (a **bleep**) but the only way to be efficient.  My Ethernet wiring is at 1000 mbps so I am getting reasonable performance now but still having configuration issues....    

Answer 1

NO this is happening from within the router itself. Windows (and other OS's) can "see" which workgroups are on the network and will display them, regardless of weather they are accessible (permissions etc)
I have a network consisting of multiple Linux machines on my home network under my own unique workgroup name.  I don't have ANY Microsoft or Apple (except "iPhone's") on this network.  The only reason I'm running a windows (smb) network and not NFS, is because occasionaly people bring me their Windows machines for repair or upgrade etc, and it's handy to be able to access windows tools I store on my FreeNAS server from the machines I'm working on - It's easy to get Linux talking to propriotry systems, but NOT the other way around  (Asan example, as far as I'm aware, Windows can't do NFS.)  
So it's like this, I upgraded my router to the new WRT 1900AC, and now, for the first ime ever, I have not only my own unique workgroup name, but also a separate "NEW" workgroup, name d "WORKGROUP" which only the WRT shows up in. 
Both of my previous routers were able to be set to "Show Up" on a particular workgroup by changing to that name within the routers settings. But I can't find how/where to do this within the WRT.
The router, whilst responsible for the obvious - routing and network access etc - is still also another network device which can be accessed to a degree from a particular workgroup (provided it''s nmame has been set)  ...For example: