kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_9P_FS_POSIX_ACL.
Result is shown for kernelversion 6.0-rc7

9P POSIX Access Control Lists

configname: CONFIG_9P_FS_POSIX_ACL

Linux Kernel Configuration
└─> File systems
└─> Network File Systems
└─> 9P POSIX Access Control Lists

POSIX Access Control Lists (ACLs) support permissions for users and
groups beyond the owner/group/world scheme.

If you don't know what Access Control Lists are, say N