src/Filter/Setting/AbstractFilterSettingTypeFactory.php
public function isNestedType()
    {
        if (!isset($this->isNestedType)) {
            $this->isNestedType = in_array(
                'MetaModels\Filter\Setting\IWithChildren',
                class_implements($this->typeClass, true)
            );
        }

        return $this->isNestedType;
    }
public function isNestedType()
    {
        if (!isset($this->isNestedType)) {
            $this->isNestedType = in_array(
                'MetaModels\Filter\Setting\IWithChildren',
                class_implements($this->typeClass, true)
            );
        }

        return $this->isNestedType;
    }
Check if the type allows children.

@return bool