You mount into EGroupware virtual file system, NOT the host file system:

sudo docker exec egroupware /usr/share/egroupware/filemanager/cli.php --user dino --password xxxxx mount smb://polizzi:xxxxxx@10.0.0.126/dati  /home/dino/dati

The above will access the smb-share as user polizzi with password xxx and mounts using EGroupware user dino, who must have root rights / be listed for root in setup. Alternativ use --user root_admin --password <password-of-setup-user-admin>.

If the smb share is accessible for every EGroupware user with the same password as used in EGroupware, then it makes more sense to use smb://$user:$password@.... which will use the users own identify to access the share.

Stefan just published a new German tutorial about that topic:

Ralf

Which I will also translate.
It is not quite finished yet and may still contain errors, but I have described your task there.

Stefan

Yes, the root_ prefix only specifies, that it’s the setup user, which you find in the password in egroupwre-docker-install.log.

Ralf

Thanks for the “hint”
I have now linked the FAQ in the tutorial.

For you the English version:

Stefan