SMB High CPU Use

So I am having high SMB use even though the system should not be this busy:

Not sure why this is the case. I have rebooted TrueNAS and the high CPU use seems to come back. I am using iSCSI to share storage to ESXi and NFS to present ISOs to ESXi. Only things using SMB are my media/music and they are not that busy.

Any thoughts on how to figure out what is hammering SMB so hard? Or is this just what it is?

Cheers,