xsecurityParentDepth 1.3.6.1.4.1.838.3.8.1.1.2

The number of 'parent' nodes inwhich the security checks are performed for any given object. The security checks start at the endpoint (the actual object requested) and traverse upwards, checking the immediate parent node, then that parent's parent, etc., until the maximun number of parents is reached, or there are no more parents.