The fruit looks like a big tree of Myrica rubra. It should be Broussonetia papyrifera, but it has no thorns.

If it's a tree with thorns, it's a Zheshu. The fruit looks like bayberry from a distance, but it doesn't look like it from a close look.

There are many aliases for fruits, such as mountain litchi and water litchi, Fujian Pharmacology, wild litchi (Fujian) and wild plum (Jiangxi and Hunan).

The picture comes from Baidu pictures.