is one piece episode 56 filler?

Now that the crew is informed about the reasons for which Apis was followed, they hurry to escape the island so Ryu could be saved, but they meet with a foe that wants Ryu to himself. Zoro and Usopp bring the ship to a thin rock at the side while Nami and Apis get Ryu onto a cart.

Luffy and Sanji fight the Marines to buy time for all preparations. In the end, the ship pulls the cart away on the search for Lost Island.