What docker and container are installed?
apt list --installed | grep docker
apt list --installed | grep container
(JetPack 4.6.1)
Also, what happens if you force mount?
docker run -it --rm --runtime nvidia --network host -v /usr/local/cuda-10.2/:/usr/local/cuda-10.2/:ro nvcr.io/nvidia/l4t-base:r32.7.1
python3 -c 'import torch'