Ciro Immobile hit a hat-trick for the result.
“We're going through an excellent period of form and deserve every point we have, as despite missing some players during this run, the team always remained solid and united," Inzaghi told Sky Sport Italia
“Samp had been in good shape, so we made it look easy with the right approach, but it most certainly was not."
“The lads believe in what we're doing and I am very happy, but we've got to continue like this and not take our foot off the gas. We've got the derby coming up and have to stay focused.
“I know what a derby means to us and what a 12th consecutive victory would mean, so that is our objective, but I cannot afford to think about it any differently to other games."