default or selected kernelversion does not have config value CONFIG_CIFS_SMB311.
Result is shown for kernelversion 6.7-rc3

SMB3.1.1 network file system support (Experimental)

configname: CONFIG_CIFS_SMB311

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>SMB3.1.1 network file system support (Experimental)
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This enables experimental support for the newest, SMB3.1.1, dialect.
This dialect includes improved security negotiation features.
If unsure, say N