The two most mature and emotionally insightful seven-year-old girls you’ve ever encountered in your life are the subjects of Petite Maman. Magnetically attentive to the serious “things of life,” as the French put it, Céline Sciamma’s 72-minute study of an intense brief friendship between two girls of extraordinary similar looks prioritizes insight and emotional awareness over any artificial plot constructs. The result is a piercingly satisfying chamber drama with a lovely intimate feel.