/usr/share/doc/ is in libftp-dev 4.0-1-2+b1.
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..
/usr/share/doc/libftp-dev/
/usr/share/doc/libftp-dev/README.Debian
/usr/share/doc/libftp-dev/README.ftplib-4.0-1
/usr/share/doc/libftp-dev/README.qftp
/usr/share/doc/libftp-dev/changelog.Debian.amd64.gz
/usr/share/doc/libftp-dev/changelog.Debian.gz
/usr/share/doc/libftp-dev/changelog.gz
/usr/share/doc/libftp-dev/copyright
/usr/share/doc/libftp-dev/examples/
/usr/share/doc/libftp-dev/examples/Makefile
/usr/share/doc/libftp-dev/examples/qftp.c
/usr/share/doc/libftp-dev/html/
/usr/share/doc/libftp-dev/html/FtpAccess.html
/usr/share/doc/libftp-dev/html/FtpCDUp.html
/usr/share/doc/libftp-dev/html/FtpChdir.html
/usr/share/doc/libftp-dev/html/FtpClearCallback.html
/usr/share/doc/libftp-dev/html/FtpClose.html
/usr/share/doc/libftp-dev/html/FtpConnect.html
/usr/share/doc/libftp-dev/html/FtpDelete.html
/usr/share/doc/libftp-dev/html/FtpDir.html
/usr/share/doc/libftp-dev/html/FtpGet.html
/usr/share/doc/libftp-dev/html/FtpInit.html
/usr/share/doc/libftp-dev/html/FtpLastResponse.html
/usr/share/doc/libftp-dev/html/FtpLogin.html
/usr/share/doc/libftp-dev/html/FtpMkdir.html
/usr/share/doc/libftp-dev/html/FtpModDate.html
/usr/share/doc/libftp-dev/html/FtpNlst.html
/usr/share/doc/libftp-dev/html/FtpOptions.html
/usr/share/doc/libftp-dev/html/FtpPut.html
/usr/share/doc/libftp-dev/html/FtpPwd.html
/usr/share/doc/libftp-dev/html/FtpQuit.html
/usr/share/doc/libftp-dev/html/FtpRead.html
/usr/share/doc/libftp-dev/html/FtpRename.html
/usr/share/doc/libftp-dev/html/FtpRmdir.html
/usr/share/doc/libftp-dev/html/FtpSetCallback.html
/usr/share/doc/libftp-dev/html/FtpSite.html
/usr/share/doc/libftp-dev/html/FtpSize.html
/usr/share/doc/libftp-dev/html/FtpSizeLong.html
/usr/share/doc/libftp-dev/html/FtpSysType.html
/usr/share/doc/libftp-dev/html/FtpWrite.html
/usr/share/doc/libftp-dev/html/doc.css
/usr/share/doc/libftp-dev/html/ftplib.html
/usr/share/doc/libftp-dev/html/index.html
/usr/share/doc/libftp-dev/html/qftp.html
/usr/share/doc-base/ftplib-dev
/usr/share/doc/libftp-dev/examples/README
/usr/share/doc/libftp-dev/examples/ftpdir
/usr/share/doc/libftp-dev/examples/ftpget
/usr/share/doc/libftp-dev/examples/ftplist
/usr/share/doc/libftp-dev/examples/ftprm
/usr/share/doc/libftp-dev/examples/ftpsend
/usr/share/doc/libftp-dev/examples/qftp