Is there any way I can do that?

It would be great.

That folder would only be accessible with appropriate client (for all major OS and mobile OS) and password.

 

 

Not natively.

 

You could host a truecrypt or similar volume on one of the shares.

I know that about using client side encryption.

Was looking for server side.

Maybe release 7...

 

Encryption in Unaid is at the whole disk level - not at any finer grain such as a folder (share) or file.

 

7 hours ago, itimpi said:

Encryption in Unaid is at the whole disk level - not at any finer grain such as a folder (share) or file.

 

?

What kind of encryption does unraid implement?

 

Not using it, but I think that it is this : https://wiki.unraid.net/Manual/Security#Data_Encryption

You can run VeraCrypt in a docker container.

13 hours ago, primeval_god said:

You can run VeraCrypt in a docker container.

 

And do what with it? How will it handle actual user interaction (password) and using the encrypted volume?

Basically the same as you would using it client side. Open the interface, select an encrypted container, enter the password to mount the it. Using docker bind mounts with the "shared" flag you can make the veracrypt mounts accessible from the host and thus shareable via SMB.