With the Oscars just days away, Toronto filmmaker Sami Khan — whose St. Louis Superman is up for Best Documentary Short — takes a break from the awards circuit to talk about the landmark American drama Daughters of the Dust, and how writer-director Julie Dash’s evocative study of people dealing with a shared trauma influenced his own work (and Beyoncé’s). Your genial host Norm Wilner was delighted for the opportunity to revisit the film.