Preheat oven to 375 F.
Prepare/warm the sauce.
In a large mixing bowl combine the ricotta cheese, diced mozzarella, grated parmesan, parsley, and 2 eggs together.
Lay Manicotti Crepes on a flat dish, scoop a heaping tablespoon of Ricotta filling into the crepe, spread around using the back of a spoon 1/2 way up the crepe-leave about a 1/2" on the sides. Carefully roll up abou the crepes 3 times while gently pressing down and pushing the filling out towards the sides.
Put about 2 cups of basic San Marzano sauce into the bottom of a baking dish. Add a little water and swirl around.
Lay the finished Manicotti, folded side down, into the pan. Repeat until done. Cover the manicotti with sauce, sprinkle more grated parmesan cheese on top and the shredded mozzarella. Cover with foil and bake for 30 minutes.
Carefully remove tray after 30 minutes. Remove foil and place back into the oven (middle-rack) and continue to cook until cheese filling is cooked through and the crepes begin to puff up a bit. Approximately 25 minutes.