Remove All cetegories filter

I have added a custom filter by the restrict_manage_posts hook and the wp_dropdown_categories. Below is the code:

add_action ( 'restrict_manage_posts', 'custom_filters' );

function custom_filters () {
    global $typenow;

    if ( 'my_custom_post_type' !== $typenow ) {
        return;
    }

    wp_dropdown_categories (
        array (
            'name'            => 'my_custom_post_type',
            'value_field'     => 'name',
            'show_option_all' =>  'All' . ' ' . $typenow,
            'taxonomy'        =>  'my_custom_post_type'
        )
    );
}

But how do I hide the default ‘All categories’ and only retain the ‘All dates’ as well as my custom filter?