is one piece episode 318 filler?

When Zoro is crafting his sword, the old man yells at him to get paid or get beaten, but Zoro leaves, Michael and Hoichael shows up and calls Zoro "Big Brother" which he tells them that he can't be their brother just because they saved him. After Zoro got his sword crafted, and he saw Michael and Hoichael and tells them to leave them alone.

Zoro was running away from the two boys one who found them in the watermelons, disguised as a civilian, and Zoro finally became safe. When Auntie shows up, he tells Zoro to leave her kids alone, but Zoro stops her from fighting him anyways.