code: public R setParentId(String parentId) {
          BoxFolder parentFolder = BoxFolder.createFromId(parentId);
          mBodyMap.put(BoxItem.FIELD_PARENT, parentFolder);
          return (R) this;
      }
docs: Sets the parent id used in the request for the item copy.
  
  @param parentId  id of the parent folder for the item copy.
  @return  request with the updated parent id.