For “White God” director Kornél Mundruczó and his wife, screenwriter Kata Wéber, their latest collaboration, “Pieces of a Woman,” has been more dramatic than your typical cinematic endeavor. Inspired by the couple’s own miscarriage, the story of a woman attempting to deal with her loss went from a play to a screenplay to a movie set in the United States starring Vanessa Kirby, Shia LaBeouf, Ellen Burstyn, Benny Safdie, Sarah Snook, and Molly Parker.