docs: public final SidACL newInheritingACL(final SidACL parent) {
          final SidACL child = this;
          return new SidACL() {
              protected Boolean hasPermission(Sid p, Permission permission) {
                  Boolean b = child.hasPermission(p, permission);
                  if(b!=null) return b;
                  return parent.hasPermission(p,permission);
              }
          };
      }