code: func ServiceWithSysctls(sysctls map[string]string) ServiceSpecOpt {
  	return func(spec *swarmtypes.ServiceSpec) {
  		ensureContainerSpec(spec)
  		spec.TaskTemplate.ContainerSpec.Sysctls = sysctls
  	}
  }
docs: // ServiceWithSysctls sets the Sysctls option of the service's ContainerSpec.