BE 10 will not be able to backup shares on NAS, unless your NAS has a Windows O/S frontend or is able to simulate an O/S. In this case NetApp does not have a Windows frontend. You have to use NDMP option, but this option is not available in BE10, only in BE11.
We also have several NetApp NAS that we were trying to backup and that's what I've found. We have BE 10.1 and BE 11 was not available at that time so we had to use NetBackup 6 with NDMP option. That NDMP option cost $8,000 alone.