Btrfs devel - Feb 2014 - What are the linux kernel versions incompatibilities with btrfs?

I read that usage of a btrfs volume with a newer kernel can render it
unreadable when that same volume is used with an older kernel. I have
a mobile storage device that will be used by different linux
distributions and kernels. What are the kernel version
incompatibilities I might have to worry about? The machines I will use
have kernel versions 3.2.0, 3.5.0, and higher.

-Brent
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