Package: btrfs-tools

"btrfs-tools" package binaries on Debian:

/sbin/btrfs-calc-size /sbin/btrfsck /sbin/btrfs-convert /sbin/btrfs /sbin/btrfs-debug-tree /sbin/btrfs-find-root /sbin/btrfs-image /sbin/btrfs-map-logical /sbin/btrfs-select-super /sbin/btrfs-show-super /sbin/btrfstune /sbin/btrfs-zero-log /sbin/fsck.btrfs /sbin/mkfs.btrfs

You may install this package on Debian with apt-get install btrfs-tools