Include support for XZ compressed file systems

configname: CONFIG_SQUASHFS_XZ

Linux Kernel Configuration
└─>File systems
└─>Miscellaneous filesystems
└─>Include support for XZ compressed file systems
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Saying Y here includes support for reading Squashfs file systems
compressed with XZ compression. XZ gives better compression than
the default zlib compression, at the expense of greater CPU and
memory overhead.

XZ is not the standard compression used in Squashfs and so most
file systems will be readable without selecting this option.

If unsure, say N.