WooCommerce - Disable autocomplete for logged-in users

<?php
// WooCommerce - Disable autocomplete for logged-in users
add_filter( 'woocommerce_checkout_fields', 'custom_checkout_fields', 99 );
function custom_checkout_fields( $fields ) {
  $fields['billing']['billing_first_name']['autocomplete'] = ' ';
  // repeat for other fields where required
  return $fields;
}