Get ancestor node of a node

Get the ancestor node of a node which is generation generations away from node.

get_ancestor_node(node, generation)

Arguments

node

node	A `ExplorerNode`.
generation	An `integer` indicating the number of generations to go back in the node tree. Negative integers and 0 will result in returning `node`. If generation is greater than the number of the node's ancestors, NULL is returned.

generation

An integer indicating the number of generations to go back in the node tree. Negative integers and 0 will result in returning node.

If generation is greater than the number of the node's ancestors, NULL is returned.