When Su Song (1020-1101)[1] was Governor of Wuzhou, his mother, Lady of the Wei Realm, boarded a boat to visit him at his place of work, and the gentleman had set out to meet her. While going upstream on the Xiang River, they encountered a rapid torrent, and the boat turned side-on to the flow and threatened to capsize. The gentleman cried out, and without fear of the water swam out to save her. Before long, the boat suddenly recovered its alignment, allowing the lady to climb onto the bank. It then capsized. It is certain that, moved by his earnest filial piety, the spirits acted to shield and support her; this is the only explanation of this occurrence.
Anon, Huhai xinwen yijian xuzhi, 前1.18 (Tale 29):
赴水救母
蘇頌知婺州日,其母魏國夫人方乘舟而來任所,公往迎迓。偶泝湘江,水暴迅,舟橫欲覆,公哀號,不懼水漲,赴水救之。未及,舟忽自正,及夫人甫出抵岸,舟乃覆。信知孝誠所感,神物護持,方能至此。
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.) Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986)
[1] On the polymath Su Song 蘇頌, see https://en.wikipedia.org/wiki/Su_Song.