Sony Pictures Classics just released a trailer for the upcoming documentary The Truffle Hunters, about the age-old tradition of using trained dogs to track down the coveted delicacy. Directed by Michael Dweck and Gregory Kershaw, the film follows a group of truffle hunters in Piedmont, Italy combing the countryside for the Alba truffle, an especially elusive species of the gourmet fungus. Even for someone like me who knows almost nothing about the culture of truffle hunting, the trailer was quietly captivating. It tracks the journey of the truffle as it is harvested from the ground by salt-of-the-…