What is the use of automatic file/printer sharing control

Hello,

I have installed Norton360 on my computer. I have read the threads based on ho to make file sharing off. In the thread it is mentioned that if my network trust level is Protected and Automatic File/Printer sharing control is OFF then no computer on my network would be able to access shared folder on my computer. I tried this but still my shared folder is getting accessed.

Only in case of Restricted Trust level access to shared folder on my computer is denied.

My question is what is the significance of Automatic file/printer sharing control in firewall settings?