private Long convertToNanoCpus(Double cpus){
        if(cpus == null){
            return null;
        }
        return (long)(cpus * 1_000_000_000);
    }
Get JSON which is used for <em>starting</em> a container

@return string representation for JSON representing the configuration for starting a container
src/main/java/io/fabric8/maven/docker/access/ContainerHostConfig.java