In a small bowl, mix the berries together. In the bottom of a serving bowl, layer 1/3 cup of the berries. Top with 1/3 c yogurt, another 1/3 cup berries, 1/3 c yogurt, another 1/3 c berries, 1/3 c yogurt. Sprinkle the hemp hearts on top of the finished parfait. Sprinkle with cinnamon and nutmeg (if using)