question: Did M1 and M2 star a film director that a film director 's employer employed
query: SELECT count(*) WHERE {
  ?x0 a ns:film.director .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
  ?x2 a ns:film.director .
  M1 ns:film.film.starring/ns:film.performance.actor ?x0 .
  M2 ns:film.film.starring/ns:film.performance.actor ?x0
  }