SharePoint 2013 - Approve a documentSet or folder using REST

Hello,

i have a document library in which the content approval is enabled. Inside it, once i create a documentSet, the ModerationStatus is pending (which is normal).

So i'm trying to change this status using REST with no success.

• The approve is only available for files and if i try to make a getfilebyserverrelativeurl with the document set URL -> 404
• Trying to change the OData__ModerationStatus with a MERGE, changes nothing; ModerationStatus and ModerationComments same thing
• Trying to use _vti_bin, same thing ..

Has anyone faced this problem before? is there a way to approve a documentSet or a folder from REST?

Will this be fixed at least in SharePoint 2016? in O365 today, not possible also (with what i've tried)

Thank you in advance.