docs: public void smoothScrollToFirst() {
          if (getLinearLayoutManager() != null) {
              final RecyclerView.SmoothScroller smoothScroller = new LinearSmoothScroller(getRecyclerView().getContext()) {
                  @Override
                  protected int getVerticalSnapPreference() {
                      return LinearSmoothScroller.SNAP_TO_START;
                  }
              };
              smoothScroller.setTargetPosition(0);
              getLinearLayoutManager().startSmoothScroll(smoothScroller);
          }
      }