Charliecloud: Lightweight and Fully Unprivileged Container for HPC

Does Sylabs has the capability of fully unprivileged containers as offered by Charliecloud to cater for users' applications security and flexibility [1],[2]?

[1] Minimizing privilege for building HPC containers:

https://arxiv.org/abs/2104.07508

[2] Charliecloud: Unprivileged Containers for User-Defined Software Stacks in HPC:

https://archive.fosdem.org/2018/schedule/event/containers_sc...