Which production company that a film director was employed by and founded was M1 's employer
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.production_company .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x0 ns:organization.organization.founders ?x1 .
?x1 a ns:film.director
}