REST API for Tree Management

Trying to find detailed documentation on the REST API for working with account hierarchies, but cannot see that in the publicly available documentation. The particular question is whether there is a REST API for duplicating the existing hierarchy version (this function is available via UI)?

The "REST API - addValueTreeNode in hierarchy" (Doc ID 2783558.1) note suggests there's the addValueTreeNode API, but documentation isn't available in either 

The R12 developer guide has detailed info on Java API, including duplicateTreeVersion from the TreeService module. I'm wondering if there's an equivalent REST API available and the documentation for it