339. Wrongful restraint.-- Whoever voluntarily obstructs any person so as to prevent that person from proceeding in any direction in which that person has a right to proceed, is said wrongfully to restrain that person. Exception.- The obstruction of a private way over land or water which a person in good faith believes himself to have a lawful right to obstruct, is not an offence within the meaning of this section. Illustration A obstructs a path along which Z has a right to pass. A not believing in good faith that he has a right to stop the path. Z is thereby prevented from passing. A wrongfully restrains Z.