9P Security Labels

configname: CONFIG_9P_FS_SECURITY

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>9P Security Labels
In linux kernel since version 3.11 (release Date: 2013-09-02)  
Security labels support alternative access control models
implemented by security modules like SELinux. This option
enables an extended attribute handler for file security
labels in the 9P filesystem.

If you are not using a security module that requires using
extended attributes for file security labels, say N.