Source

File: wp-includes/customize/class-wp-customize-partial.php

final public function check_capabilities() {
		if ( ! empty( $this->capability ) && ! current_user_can( $this->capability ) ) {
			return false;
		}
		foreach ( $this->settings as $setting_id ) {
			$setting = $this->component->manager->get_setting( $setting_id );
			if ( ! $setting || ! $setting->check_capabilities() ) {
				return false;
			}
		}
		return true;
	}