For his debut feature film, “In Flames,” the Pakistani Canadian filmmaker Zarrar Kahn pulls inspiration from his experience living in Karachi as a child. The film is about a mother and daughter who are trying to survive as they deal with the reality — and often horror — of living in a patriarchal society. Zarrar speaks with Tom about the film, what it was like confronting his childhood memories, and where his idea for the story originally came from.