Jazz Tangcay Artisans EditorFilmmakers Michael Dweck and Gregory Kershaw wore multiple hats to capture the lives of truffle hunters in Italy’s Piedmont region, acting as directors, writers, producers and cinematographers.Dweck and Kershaw’s Oscar-shortlisted documentary “The Truffle Hunters,” which opens Friday in theaters, follows several elderly men who have devoted their lives to searching out the increasingly rare fungi.