SEP firewall policy to block 445 port is not functioning in same network segment

Dear Experts,

To prevent the ransomware attack, I have created a rule in SEP firewall policy as to block the 445 port from all client systems. 

Even though in the NTP traffic logs appearing as blocked, but still I can access the shared folders in the other clients within the same network segment. 

I have some file servers and added another rule to access those servers (Rule= Allow 445). That is also working fine.

So, I'm  looking for the solution of the malfunctionality of the rule 'block 445' in the same segment. Please help us as soon as possible.