question: Was M1 's director 's country of nationality a film editor 's employer
query: SELECT count(*) WHERE {
  ?x0 ^ns:people.person.nationality ?x1 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
  ?x1 ns:film.director.film M1 .
  ?x2 a ns:film.editor
  }