For CIFS presented from NetApp arrays there aren't really any strict requirement and is largely base on how the environment is setup.
If there are points of latency between MediaAgent and the actual storage, you might need to look at timeout parameters from the filesystem layer, so read/writes wont fail.
Also need to consider the maximum amount of open connections (incase NetApp has a limit), so connections won't be refused
Here is a good starting point - https://documentation.commvault.com/commvault/v11/article?p=9420.htm
Overall it would be good to see if there are any limits on the Storage first and see if these parameters can be tweaked