code: func (a *ACL) SetFileACLDefault(path string) error {
  	acl_set_file, err := getSymbolPointer(a.lib.handle, "acl_set_file")
  	if err != nil {
  		return err
  	}
  
  	cpath := C.CString(path)
  	defer C.free(unsafe.Pointer(cpath))
  
  	ret, err := C.my_acl_set_file(acl_set_file, cpath, C.ACL_TYPE_DEFAULT, a.a)
  	if ret < 0 {
  		return errwrap.Wrap(errors.New("error calling acl_set_file"), err)
  	}
  
  	return nil
  }
docs: // SetFileACLDefault sets the "default" ACL for path.