[TOptional](API\Runtime\Core\IO\TOptional)< [TArray](API\Runtime\Core\Containers\TArray)< [UsdUtils::FUsdPrimMaterialSlot](API\Plugins\USDUtilities\FUsdPrimMaterialSlot) > > GetSubtreeMaterialSlots ( const [UE::FSdfPath](API\Plugins\UnrealUSDWrapper\UsdWrappers\FSdfPath) & Path )