Unset data in custom post type WordPress API (wp-json)

If possible, only the examples shown in internet is:

function qod_remove_extra_data($data, $post, $context) {
    // We only want to modify the 'view' context, for reading posts 
    if ($context !== 'view' || is_wp_error($data)) {
        return $data; 
    } 
    // Here, we unset any data we do not want to see on the front end: 
    unset($data['author']); 
    unset($data['status']); 
    // Continue unsetting whatever other fields you want return $ data;
}
add_filter('json_prepare_post', 'qod_remove_extra_data', 12, 3);

and right is:

function qod_remove_extra_data($data, $post, $context) {
    // We only want to modify the 'view' context, for reading posts 
    if ($context !== 'view' || is_wp_error($data)) {
         unset ( $data->data['excerpt']); //Example
         unset ($data->data['content']); //Example
         unset ($data->data['name field to remove']); 
         //or 
         unset ($data->data['name field to remove']['name subfield if you only want to delete the sub-field of field']); 
         return $data; 
     }
}
add_filter('rest_prepare_post', 'qod_remove_extra_data', 12, 3);

IMPORTANT:
Is:

add_filter('rest_prepare_post', 'qod_remove_extra_data', 12, 3);

Not:

add_filter('json_prepare_post', 'qod remove extra_data', 12, 3); //WRONG (No underscores)

If is Custom Post Type:

add_filter('rest_prepare_{$post_type}', 'qod_remove_extra_data', 12, 3);

EXAMPLE: Name post type = product;

 add_filter('rest_prepare_product', 'qod_remove_extra_data', 12, 3);

With this code can remove the fields that you want the JSON. By using rest_prepare}_{$ post_type decide that you eliminated every post_type fields, thus only affected the post_type you want and not all.