It is a different thing. They point of containers is that they do share the same kernel, and that each container is just a different namespace. If each entity

It is a different thing. They point of containers is that they do share the same kernel, and that each container is just a different namespace. If each entity has a different kernel, they are VMs. VMs can be also pretty thin and have shared immutable store for their base image, but they are not containers anymore. Similarly, Xen DOM-Us are also VMs.