[HenryArmitage]

I don’t believe you can filibuster a CR under the rules (it is like an appropriation bill)

hmm.. this is from a slate article i read in july-

Fellow Republicans have spent a few days battering the "defund" movement, insisting that it's a waste of time—no way you get the Senate to agree to it, no way you get the president to sign it. Cruz's first strategic answer to this was insisting that the CR could be filibustered, "if we hold 41 Republicans." They didn't need a majority. "The model I would turn to is the battle over guns," said Cruz, a battle that ended in a Republican victory even though most senators voted for a background checks bill.

[glm]

I checked. It is the budget bill which cannot be filibustered. I put appropriation bills under this type. Budget resolutions cannot be filibustered. Any bill which has a statute dictating a set amount of hours for debate cannot be filibustered. The Congressional Budget Act of 1974 set the amount of hours for budget resolutions at 50 hours, after which a vote must be held.