instead of passing through the fstab file, try to create a separate service which create the necessary mount point
for exemple create the file /etc/66/service/binderfs with the following
[main]
@ type = oneshot
@ description = "mount binderfs type"
@ version = 0.0.1
@ user = ( root )
[start]
@ execute = (
execl-toc -m /dev/binderfs -t binder -d binder
66-yeller -p binderfs service successfully started
)
The exec-toc will check if the /dev/binderfs is a mountpoint, if not it will create the /dev/binderfs directory and mount it with the following mount command
# mount -t binder binder /dev/binderfs
Then enable it at your e.g. root tree and tell us what happens.