How to filter DiscrimnatorMaps with Api Platform?

Question

Using Api Platform 2.6, and SF 4.4, I would like to use an Entity as a Discriminator and filter it.

I have 3 Entities: Resource, Collaborator and Material

Resource is the super mapped class, and defined like this:

/**
 * @ApiResource
 * @ApiFilter(SearchFilter::class, properties={
 *     "company": "exact",
 *     "collaborator.lastname":"partial",
 *     "lastname": "partial",
 *     "title": "partial",
 *     "material.title":"partial"
 * })
 * @Entity
 * @InheritanceType("SINGLE_TABLE")
 * @DiscriminatorColumn(name="discr", type="string")
 * @DiscriminatorMap({"resource"="Resource", "collaborator"="Collaborator", "material"="Material"})
 */
class Resource
{

I want to allow to filter all resources (Collaborator and Material) by some of their properties (for example title belongs to Material, and lastname belongs to Collaborator).

For now, these filters don't appear in the Api Doc, is it possible at least ? I can't find many informations on Git / Doc.