At the outset of Laura Gonçalves’s animated short “The Garbage Man,” a group of relatives gather around a table, and the conversation drifts—naturally, inevitably—to the filmmaker’s late uncle. Since her uncle’s death, more than a decade ago, Gonçalves has become fascinated with her family’s love of reciting the same well-worn stories over and over. As time passes and stories pile up, it can become difficult to distinguish between original memories and those borrowed from family lore or photogra