wp-disable-all-jetpack-banners.php

<?php

/**
 * Disable All JetPack Banners (except on JetPack page)
 */
add_action('admin_print_scripts', 'hwk_disable_jetpack_banners');
function hwk_disable_jetpack_banners(){
    
    $current_screen = get_current_screen();
    if(empty($current_screen))
        return;
    
    if(stripos($current_screen->base, 'jetpack') !== false)
        return;
    
    global $wp_filter;
    if(!isset($wp_filter['admin_notices']) || empty($wp_filter['admin_notices']))
        return;
        
    foreach($wp_filter['admin_notices']->callbacks as $priority => &$wrappers){
        foreach($wrappers as $name => $values){
            
            $name_seriliazed = serialize($name);
            $values_seriliazed = serialize($values);
            
            if(stripos($name_seriliazed, 'jetpack') === false && stripos($values_seriliazed, 'jetpack') === false)
                continue;
            
            unset($wrappers[$name]);
            
        }
    }

}