Bava Metzia 119: Roots and Leaves

A last mishnah! On divided properties, including gardens, when one is above the other - who owns the produce? Unusually, the mishnah explains the rationale of the disputants' different views here, and the garden's nourishment from above. Also: one who can reach out one's hand to take produce is allowed to take the produce, but what if he can only reach the roots or only the leaves? Plus, the Persian king Shapur, who likes R. Shimon's approach (he seems to have liked Jewish law... might he have been Shmuel?).