Add the linguine to the boiling water. when the sauce is ready and the pasta is al dente, stir the parsley and reserved bacon into the sauce. Remove the pasta with tongs and add directly to the sauce, reserving the pasta water. Toss to coat the pasta with the sauce, adding a splash of pasta water if the pasta seems dry. Remove the skillet from the heat, sprinkle with grated grana padano, toss, and serve.