Explanation
Using seccomp does not limit a Docker container's access to host resources, such as CPU or memory.
Seccomp is a Linux kernel facility that allows filtering system calls made by a process. It can be used to enhance the security and isolation of a container by restricting its access to certain system calls. However, it does not affect the resource allocation or consumption of a container. References:
https://docs.docker.com/engine/security/seccomp/,
https://www.kernel.org/doc/html/v4.14/userspace-api/seccomp_filter.html

Explanation
Namespaces are a Linux kernel feature that isolate containers from each other and from the host system. They limit the access of a container to host resources, such as CPU or memory, by creating a separate namespace for each aspect of a container, such as process IDs, network interfaces, user IDs, etc. This way, a container can only see and use the resources that belong to its own namespace, and not those of other containers or the host12. References:
* Isolate containers with a user namespace | Docker Docs
* Docker overview | Docker Docs

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