Ferry prices from Naples to Positano

This says no.

http://www.napoliunplugged.com/get-amalfi-coast.html

To get to Positano from Naples will require 2 separate ferrys. The first from Naples to Sorrento, and the second from Sorrento to Positano.
The cost for the two is €28,90. Total time not including transfers is 1 hour 20 minutes.

Schedule

http://www.positano.com/en/ferry-schedule?from=napoli&to=sorrento