How to open NFS log

I'm using Omnios (Unix) and i want to log everything about nfs. I have some VM on my NFS share and sometimes connection brokes 3-5 second. I can not find a reason for that on dmesg or syslog. I can watch SMB logs from "dmesg" but nfs logs not writing there. I think i need to open my logs someway. Any help works. Ty.