WP Smush - Skip a directory or a list of directories from Smushing

skip_directory_smush.php

<?php
//Allows to skip multiple directories, as specified in array
add_filter( 'wp_smush_image', 'filter_by_directory', '', 2 );
function filter_by_directory( $smush, $id ) {
    $file_path = get_attached_file( $id );
    //List of directories to be ignored
    $dirs = array(
        'uploads/2016/11',
        'uploads/2017/01'
    );
    if( !empty( $file_path ) ) {
        foreach($dirs as $path) {
          if( strpos($file_path, $path ) !== false) {
                return false;
          }
        }
    }
    return $smush;
}

//Allows to skip a single path while smushing image
add_filter( 'wp_smush_image', 'filter_by_directory', '', 2 );
function filter_by_directory( $smush, $id ) {
    $file_path = get_attached_file( $id );
    if( !empty( $file_path ) && false !== strpos( $file_path, 'uploads/2016/11' ) ) {
        return false;
    }
    return $smush;
}