In the FreeBSD base system - no chance. FreeBSD does not support anything but SMB1 and I have argued that they should entirely remove it because it is next to worthless that way.
You could try to install the Fuse module inside the jail, then load it in the NAS host system and perform the mount in the jail. Have not tried that, yet, but the software exists and is supposed to be stable.
SMBNetFS is a filesystem that allow you to use samba/microsoft network in the same manner as the network neighborhood in Microsoft Windows. Featuries: * you can use Samba/Microsoft network as a regular Unix filesystem * workgroup/computer/share entries are dynamically created *...
www.freshports.org
Since it contains a kernel module it is absolutely necessary to have the jail you use for installation run the same version of FreeBSD as the host system.
BTW - are you running an outdated FreeBSD version? Because you posted in the "
FreeNAS (Legacy Software Releases)" section. If that is indeed the case first of all you need to update your FreeNAS/TrueNAS to a current supported version, e.g. TN CORE 13.0.
HTH,
Patrick