How to get the quantity of CIFS connection in use

I am moving from VNX to Isilon platform and as part of the migration I want to identify the extent of CIFS usage from each data  mover.

Like how many CIFS connections are active or in use.

I have narrowed down to the two below command :

server_netstat server_2 | grep -I est | grep -i  445

server_netstat server_2 | grep -i est | grep -i cifs

But i am not sure what is difference  between the two. Can anyone help?

there is an service name  entry in /etc/services named "cifs"