docs: function createDocker(dockerhost) {
    dockerhost = dockerhost || 'unix:///var/run/docker.sock';
  
    if ((/^(http|tcp)/).test(dockerhost)) return httphost(dockerhost);
    if ((/^unix\:\/\//).test(dockerhost)) return sockethost(dockerhost);
  
    throw new Error('Cannot parse dockerhost ' + dockerhost);
  }